JPH04212908A - Lens frame and its manufacture - Google Patents

Abstract

PURPOSE:To provide a lens frame with an imager which is simply constituted, superior in heat radiating effect of the imager and cost effective. CONSTITUTION:A lens frame consists of a supporting body 11 which mainly supports guide shafts 15, 16 and is fitted with a CCD 19 in a preferable heat radiating efficiency, the first lens group frame 13 and the second lens group frame 14, the guide shafts 15, 16 to support the respective lens group frames in a sliding manner, and a zoom cam 12 which moves the respective lens group frames forward or rearward in the direction of the optical axis (0). The supporting body 11 integrally constitutes of front and rear plate parts 11a, 11b, a center plate part 11k, and a side plate part 11c. The position of the guide shaft 15 is regulated by means of a regulating plate 17.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens frame, and more particularly to a lens frame which is an optical device having an imager.

0002

[Background Art] Image pickup tubes and solid-state image pickup devices used in recent electronic still cameras and video cameras, etc.
As the imager becomes smaller or its performance is improved, many proposals have been made regarding the lens frame to which the imager is mounted. These proposals are aimed at increasing the precision and downsizing of the lens frame, improving the heat dissipation effect of the imager, and reducing costs.

For example, a video camera disclosed in Japanese Patent Application Laid-Open No. 62-43977 has a structure in which a solid-state image sensor is attached to the rear part of the lens rear lens whose imaging optical section is an integrally molded resin product. be. Also, Utsukai Showa 62-493
The television camera disclosed in Publication No. 87 is characterized in that an optical system block is attached to the inner wall of the outer casing of the television camera via a front plate made of an aluminum alloy. Further, the heat dissipation device for a solid-state image sensor disclosed in Japanese Utility Model Application Publication No. 19861/1986 is provided with a heat dissipation member closely attached to the back side of the solid-state image sensor, and the heat dissipation member is extended to the camera housing. It is characterized by

Furthermore, the solid-state imaging camera disclosed in Japanese Utility Model Application Publication No. 2-5985 includes a solid-state imaging device whose imaging optical section is fixed to the light exit portion of a color separation prism, and a heat sink attached to this device. The present invention is characterized in that it has a heat radiating member with low thermal resistance that connects the prism mounting fittings and the heat radiating plate.

[0005]

[Problems to be Solved by the Invention] However, in the above-mentioned Japanese Patent Application Laid-open No. 62-43977, the rear lens portion, which has the front lens portion and the mounting portion for the solid-state image sensor, is made of a highly precise resin. Since it uses a molded product, it is disadvantageous in terms of parts cost. In addition, since it is made of resin, there are problems such as the fact that the heat dissipation effect of the solid-state image sensor cannot be expected to be very effective.

Furthermore, the device disclosed in Japanese Utility Model Application Laid-open No. 62-49387 has a problem in that the structure for attaching the optical block to the aluminum alloy front plate is complicated, and the structure becomes large-scale due to the large number of parts. Furthermore, Utsukai Showa 62-1
In the device disclosed in Japanese Patent No. 9861, the heat dissipation member for the solid-state image sensor is independent from the optical member, and the heat dissipation effect of the optical member cannot be expected. Furthermore, the device disclosed in Japanese Utility Model Application Publication No. 2-5985 has the disadvantage that it is necessary to provide a member exclusively for heat dissipation, which complicates the structure itself and increases the number of parts.

[0007] Note that an efficient heat dissipation structure of the solid-state image sensor, which is the imager mentioned above, is essential for its function, and if heat dissipation is not performed efficiently, the temperature inside the device may rise. This causes a problem in that the dark current component of the output current increases and noise increases.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by constructing a lens frame with a structural member that also serves as a heat dissipating member, an optical member, and a guide member for the optical member. To provide a lens frame that can increase the heat dissipation efficiency of the lens, have high precision, reduce the number of parts, and reduce the cost of parts, and a method for manufacturing the same.

[0009]

[Means for Solving the Problems] The lens frame of the present invention includes a first member portion that is closely located on the imager and also serves as a heat dissipation member for positioning the imager, and a first member portion that is spaced apart from the first member portion by a predetermined distance. a second member portion facing each other, and the first member portion
A third member that is integrally provided with the first and second member parts and maintains the relative position between the first and second member parts such that the first and second member parts are continuous at both ends of the third member. - a structural member consisting of a first member part and a second member part, and an optical member provided movably between the first member part and the second member part so as to connect both the member parts. A guide member for guiding the member.

[0010] Furthermore, there is provided a method for manufacturing the lens frame, comprising:
a first step of temporarily arranging the optical member at a predetermined position between the first and second member parts; and inserting or coupling the guide member to the predetermined part of the optical member temporarily arranged in the first step. , a second step of constructing the guide member while allowing a predetermined degree of freedom between the first and second member portions, and a second step of constructing the guide member after the construction state of the second step;
and a third step of fixing it to the first and second member portions to ensure a predetermined positional accuracy.

[0011]

[Operation] In the lens frame, the optical member supported by the integral structure member on which the imager is disposed is guided by the guide member to carry out the imaging operation, and the heat generated in the imager is Heat is efficiently dissipated through one member, allowing the imager to fully demonstrate its characteristics.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings. FIG. 4 is an external view of a digital still camera with a built-in lens frame, showing a first embodiment of the present invention. As shown in this figure, the lens frame built into the camera body 1 is
A first lens group frame 13 and a second lens group frame 14, which are optical members and hold the first lens group and the second lens group, respectively; and a CCD 19, which is a solid-state image sensor, which is an imager.
Guide shafts 15 and 16 which are guide members (not shown)
and a support 11 which is also a structural member not shown.
Consists of etc. Note that the guide shafts 15 and 16 and the support body 11 are illustrated in FIG. Furthermore, a strobe light emitting window 3 is provided on the front of the main body 1, and a display section 4 that also serves as a monitor is provided on the top surface.
On the side is an insertion slot 1a for a memory card 5 for storing image data.
are arranged respectively.

FIG. 1 is a side view of the lens frame. 2 is a view taken from the subject side A in FIG. 1, and FIG. 3 is a view taken from the CCD side B of FIG. As shown in those figures, the support body 11 has a front plate part 11a of the second member part and a rear plate part 11b of the first member part, which stand up opposite each other on the optical axis O, and the relative position of the two members. 3rd to hold
The center plate portion 11k which is a member and the center plate portion 11k
It is integrally formed with side plate portions 11c standing up from both side surfaces of.

The front plate portion 11a has a photographing lens window 11j around the optical axis O, a play hole 11d that fits into the guide shaft 15 with a predetermined gap, and a shaft hole 11e that fits with the guide shaft 16 without a gap. are arranged respectively. On the other hand, the rear plate portion 11b has a contact surface 11n on the inner surface side of the central portion thereof, on which the package of the CCD 19 is positioned in close contact with the CCD 19;
Insertion hole 11h for connection pin 19 and guide shaft 15
, 16, and a plurality of heat radiation holes 11i are provided (see FIG. 3). Further, the upper surface of the center plate portion 11k is arranged such that the first and second lens group frames 13, 1
Cam reference plane part 11 for zoom cam 12 for 4 drives
m, and the zoom cam 12 is used as the flat part 11m.
The upper part is guided by a cam guide (not shown) and is slidably mounted in a direction H (see FIG. 2) perpendicular to the optical axis O.

Guide shafts 15 and 16 are inserted into the support body 11 through shaft holes 11d and 11e in the front plate portion 11a and through shaft holes 11f in the rear plate portion 11b, respectively. The first lens group frame 13 and the second lens group frame 14 are supported on the guide shafts 15 and 16 through their respective guide holes 13a and 14a and cutout guide portions 13b and 14b so as to be freely slidable. It is attached. The front end of the guide shaft 15 is fitted into the shaft hole 17d of the adjustment plate 17, and the adjustment plate is adjusted such that the guide shaft 15 is positioned parallel to the guide shaft 16, the flat portion 11m, and the optical axis O, etc. Adjust the mounting position of 17 and fix with screw 18.

The first lens group frame 13 and the second lens group frame 14 each have drive pins 13c and 14c connected to the lens group frame 13 and the second lens group frame 14.
The zoom cam 12 is fitted into a cam groove (not shown) provided in the zoom cam 12, and moves forward and backward in the optical axis O direction as the zoom cam 12 moves in the direction H. The zoom motor 20 for driving the zoom cam 12 is disposed in a space on the bottom side of the center plate portion 11k. The bottom of the CCD 19 package is the support 1.
It is attached to the CCD abutting surface 11n of the rear plate portion 11b of 1 with good heat transfer. Further, after the connecting pin 19a is inserted into the insertion hole 11h, the CCD printed circuit board 30
connected to.

Next, the procedure for assembling the lens frame will be explained. First, in the first step, the first and second
The lens group frames 13 and 14 are mounted on the front and rear plate parts 11 on the support body 11.
Temporarily placed at a predetermined position between a and 11b. In the second step, the guide shafts 15 and 16 are inserted into the shaft holes 11d and 11e.
Alternatively, it is inserted from 11f, and further inserted through the guide holes 13a, 14a and notch guide portions 13b, 14b of the first lens group frame 13 and the second lens group frame 14. By this insertion, the lens group frames 13 and 14 are supported by the support body 11 with a predetermined positional degree of freedom.

Subsequently, in the third step, the guide shaft 1
5 and 16 are kept in the parallel state using a jig or the like, and the tip of the shaft 15 is inserted into the adjustment plate 17 to adjust the position and fix the adjustment plate 17 to the support 11. This fixation allows the guide shaft 15 to be held at a predetermined positional accuracy. Note that the fixing portion may be additionally fixed with an adhesive to eliminate wobbling.

In the lens frame of this embodiment constructed as described above, the zoom motor 20 is driven based on instructions from a system controller (not shown), and the first lens group frame 13,
The second lens group frames 14 are each moved to a predetermined position,
The subject image is now formed on the imaging plane of the CCD 19. Then, an image signal of the subject is output from the CCD 19.

The support 11 in the lens frame can be formed by processing a metal plate, for example, and is very advantageous in terms of cost compared to a conventional resin integrally molded frame. Furthermore, regarding the rigidity, by having the side plate portions 11c by bending, deformation such as twisting or falling due to external force of the front plate portion 11a and the rear plate portion 11b is extremely reduced, and high optical precision of the lens frame can be ensured.

Further, the flatness of the cam reference surface 11m is maintained by the reinforcement of the side plate portion 11c, allowing smooth lens movement. Furthermore, since the support position of the guide shaft 15 can be adjusted during assembly, the dimensional accuracy of the support body 11 itself is not required to be very high, and high precision can be expected for the lens frame. Further, the side plate portion 11c can be used as various attachment portions. In this case, deformation due to tightening is difficult to reach the front plate part 11a, the rear plate part 11b, and the center plate part 11k due to the rigidity of the side plate parts 11c.

Furthermore, the heat dissipation of the CCD 19 is carried out through the rear plate portion 11.
Each plate portion 11k is integrally formed and radiates heat from b.
, 11c, and 11a and radiates the heat, so that the cooling is extremely efficient. Further, heat is also radiated through the heat radiation hole 11i and the insertion hole 11h provided in the front plate portion 11a, thereby increasing the heat radiation effect. In particular, if the material of the support body 11 is made of aluminum alloy or the like, the effect becomes remarkable. Note that the lens frame of this example is an open type in terms of light shielding due to the structure of the support 11, but since this method uses an imager, strict light shielding is not required and this problem is not solved. No.

FIG. 5 is an exploded perspective view of a lens frame showing a second embodiment of the present invention. In this embodiment, adjustment plates 27a and 27b of a different structure from the adjustment plate 17 are used. The adjustment plates 27a and 27b are parts manufactured using the same mold, and have blind holes 27d formed by half-cutting opposite the guide shafts 25 and 26 located on both sides of the photographing lens window 27j. is provided (see FIG. 6). The dimensions of the blind hole 27d are such that the shafts 25 and 26 can be fitted without any gaps. Note that since the same mold is used, there is almost no variation in the hole position between the adjustment plates 27a and 27b.

The rest of the structure is substantially the same as that of the previous embodiment except that all guide shaft insertion holes in the support are play holes. That is, the support body 21 has a front plate portion 21a of the second member portion that stands opposite to each other along the optical axis O.
and the rear plate part 21b of the first member part, and the center plate part 21k which is the third member part that maintains the relative position of both members.
and side plate portions 21c standing up from both sides of the center plate portion. The front plate portion 21a is provided with a photographing lens window 21j around the optical axis O, and two play holes 21d into which the guide shafts 25 and 26 are inserted with a predetermined gap. On the other hand, the rear plate portion 21b has an abutment surface 21n for a CCD (not shown) package, an insertion hole 21h for a CCD connection pin, etc., and guide shafts 25, 26 on the inner surface of the center portion thereof. Two play holes 21f are provided that are inserted with a predetermined gap.

The guide shafts 25 and 26 are inserted into the play hole 21d of the front plate portion 21a and the play shaft hole 21f of the rear plate portion 21b, respectively. The first lens group frame 23 and the second lens group frame 24 are attached to the guide shafts 25 and 26, and the respective guide holes 23a and 24a and the cutout guide portion 2
3b, 24b and is slidably attached. In order to fix the guide shafts 15 and 16 in predetermined parallel positions, the shafts 15 and 16 are held parallel to the optical axis O, the flat part 21m, and between the two shafts using a jig, etc., and the shafts 15 and 16 are
, 16 are inserted into the blind holes 27d of the adjusting plate. Then, the above fixation is achieved by fixing the adjustment plates 27a, 27b to the support body 21.

The procedure for assembling the lens frame of this embodiment configured as described above is substantially the same as that of the previous embodiment, and in the first step, the first and second lens group frames 23,
24 is temporarily placed at a predetermined position on the support body 21 between the front and rear plate parts 21a and 21b. Then, in the second step, the guide shafts 25 and 26 are inserted through the idle holes 21d, and then inserted through the guide holes 23a and 24a and the notched guide portions 23b and 24b of the first lens group frame 23 and the second lens group frame 24. let By this insertion, the lens group frames 23, 2
4 is supported by the support body 21 with a predetermined degree of freedom. Subsequently, in a third step, the guide shafts 25 and 26 are kept in the parallel state using a jig or the like, and the adjustment plate 27 into which the shafts 25 and 26 are fitted is adjusted and fixed to the support body 21. This fixation allows the guide shafts 25 and 26 to be held at a predetermined positional accuracy.

As explained above, in the lens frame of this embodiment, the insertion holes for the guide shafts 25 and 26 of the support body 21 are aligned with the play holes 2.
7d, there is no need to manage its positional accuracy, which is very advantageous in terms of parts cost.

Furthermore, the guide shafts 25 and 26 can be easily inserted into the support body 21 in the second step, which is advantageous in terms of assembly.

[0029]

[Effects of the Invention] As described above, the lens frame of the present invention has
The device is constructed of a structural member that also serves as an integrated heat dissipation member, an optical member and its guide member, and the present invention reduces component costs by using the above-mentioned structural member as a simple integrated component. At the same time, the integrated structure makes it possible to increase the heat dissipation efficiency of the imager, and by making adjustments during assembly, it is possible to achieve high precision as a lens frame, and to reduce the number of parts. It has remarkable effects such as the ability to

[Brief explanation of the drawing]

FIG. 1 is a side view of a lens frame showing a first embodiment of the present invention.

FIG. 2 is a view taken along arrow A in FIG. 1 above.

FIG. 3 is a view taken along arrow B in FIG. 1 above.

FIG. 4 is an external perspective view of a digital still camera incorporating the lens frame shown in FIG. 1;

FIG. 5 is an exploded perspective view of a lens frame showing a second embodiment of the present invention.

FIG. 6 is a sectional view of the guide shaft support portion of the lens frame shown in FIG. 5;

[Explanation of symbols]

Claims (3)

[Claims] 1. A first member portion that is closely located on the imager and also serves as a heat dissipation member for positioning the imager;
A second member part facing the member part at a predetermined distance, and the first member part and the second member part are connected to each other at both ends of the first member part and the second member part. a structural member consisting of a third member part integrally provided with the third member part for maintaining the relative position between the two member parts; and a structural member comprising a third member part provided integrally with the member part; What is claimed is: 1. A lens frame comprising: a guide member for guiding an optical member movably provided between the two member parts, the guide member being provided so as to connect the two member parts. 2. The lens frame according to claim 1, wherein at least a portion of said third member portion has a guide surface for guiding a member for driving said optical member. 3. A first member portion that is closely located on the imager and also serves as a heat dissipation member for positioning the imager;
A second member part facing the member part at a predetermined distance, and the first member part and the second member part are connected to each other at both ends thereof, and the first member part and the second member part are connected to each other at both ends thereof. a structural member consisting of a third member part integrally provided with the third member part for maintaining the relative position between the two member parts; and a structural member comprising a third member part provided integrally with the member part; A method for manufacturing a lens frame, the lens frame having a guide member for guiding an optical member movably provided between the two members, the guide member being provided so as to connect the two members. A first step of temporarily arranging the guide member at a predetermined position between the first and second member portions, and inserting or coupling the guide member to the predetermined portion of the optical member temporarily placed in the first step. - as the first and second members -
a second step of constructing the guide member while allowing a predetermined degree of freedom between the parts; and a second step of constructing the guide member with the first and second members in order to ensure a predetermined positional accuracy after the construction state of the second step.
A third step of fixing the lens frame to the lens frame.